300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ524

Infrastructure Security

Unicast Reverse Path Forwarding (uRPF) has been configured on a service provider network to protect it from spoofed-based attacks. Which of the following are valid uRPF modes?

Choose two
  • A Strict mode
  • B Open mode
  • C Closed mode
  • D Block mode
  • E Loose mode
Explanation

uRPF supports strict mode and loose mode. Strict mode validates that the return path to a packet’s source uses the same interface on which the packet arrived; loose mode validates that the source address is reachable in the forwarding table without requiring that same interface.

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